Importance

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Abstract

In a process for operating a press unit comprising a press, more particularly a forging press, having a hydraulic driving and control system that causes the working stroke movement of the press to follow a substantially sinusoidal course, and at least one integrated forging manipulator, synchronization of the working stroke of the press and the stroke of the tong arm of the manipulator is effected by a driving and control system of the forging manipulator by which a stroke movement of the tong arm of the forging manipulator adjusted to match the working stroke of the press and having the same frequency as that of the working stroke movement of the press, but with a smaller amplitude, is produced. For raising and lowering of the tong arm at least one continuously variable, reversible-flow pump is associated with the forging manipulator.

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First Claim